Improvement in piston-packing



G. DRYDEN. Piston-Packing.

No. 207,595. Patented Sept. 3. I878.

Eg 7 III 7 @mfW M 2% UNITED STATES PATENT QFFICE.

GEORGE DRYDEN, OF WORCESTER, MASSACHUSETTS, ASSIGNOR OF ONE- HALF HISRIGHT TO EDMUND CONVERSE, OF SAME PLACE.

IMPROVEMENT IN PISTON-PACKING.

Specification forming part of Letters Patent No. 20 7,595, datedSeptember 3, 1878; application filed February 25, 1878.

To all whom it may concern:

Be it known that I, GEORGE DRYDEN, of lVorcester, in the county ofWorcester and State of Massachusetts, have invented certain Improvementsin Piston-Packing, of which the following is a specification:

My invention relates to an expansible sectional packing-ring forsteam-pistons, &c.; and the improvements consist in constructing thesections of said rings with supporting lips or shoulders, to retain thecoupling-pieces in position and prevent their falling out when the ringis removed from the piston, whereby the ring is rendered capable ofbeing carried without falling apart, and the coupling-pieces are held inplace without the aid of the piston Or other special devices.

In the accompanying drawing, Figure 1 represents a face View Of myimproved device; and Figs. 2, 3, and 4, cross-sections taken,respectively, on the lines 90 w, 3 y, and z z of Fig. 1, a plan view ofthe joint being shown in connection with each.

In constructingmy improved ring any wellknown form of coupling piece maybe employed, the invention relating merely to the manner of sustainingthe same.

In the drawing, A represents the ring, in this case. consisting of threesections; and B, the coupling or connecting pieces, of which three formsare shown,respectively of L shape, U shape, and inverted-T shape incross-section, as indicated in Figs. 2, 3, and 4. The ends of each ofthe sections of the ring A are formed with a transverse slot, 0, and alip or shoulder, a, extending outward under the coupling-pieces B, andmeeting at their ends when the ring is contracted or closed midway ofthe length of each of the conplingpieces.

In practice, I prefer to extend the lower side or face of thecoupling-pieces outward at the ends beyond the body of the same, asshown at b, Fig. 1, thereby giving a firm support to the couplings whenthe ring is expanded.

It will be observed that when thus constructed the ring may be carriedabout readily and conveniently without danger of falling apart; that theends of the sections and the coupling-pieces are caused to remain inproper position. in relation to each other, and prevented from rising orfalling out of line; and that no special devices are necessary to holdthe coupling-pieces up to their place when the ring is applied to thepiston.

I am aware that sectional packing-rim gs connected by couplingpieceshave been hitherto made in various forms, and hence I claim only myimproved construction of the parts, as hereinbefore specified.

Having thus described my invention, what I claim is 1. In apiston-packing, the coinbinationot' the abutting sections A, havingtransverse slots 0 in their ends, and the coupling-blocks B, arranged tocover the joints between the sections and seated in the slots 0, asshown and described.

2. The coupling-blocks provided with the extended ends or lips I) b,'incombination with the packing-sections A, provided with the inside lip,a, and slots 0, as shown.

GEORGE DRYDEN.

'itnesses: A

HIRAM THOMPSON, GEO. M. WOODWARD.

